An ROI does not have a GM probabability, so I'm not sure what to say.
Perhaps he/she wants the average amount of GM in the ROI relative to the
size of the ROI? You can get this with mri_compute_volume_fractions.
This will produce maps of the GM fraction in each voxel (separating
cortical and subcortical). Just use mri_segstats in the same way you
used it for the PET. The output will be the fraction of the ROI that is GM.
On 4/24/2020 8:41 AM, Shane Schofield wrote:
External Email - Use Caution
Hi Freesurfer Team,
I have used mri_segstats to get ythe mean PET uptake across all the
parcellations in the WMPARC space. These values were calculated in the
native PET space (following the DTI tutorial). A reviewer asked what
is the grey matter probability of the ROI and I am not sure how to
address this. Any help is kindly appreciated. Thanks.
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